海洋大气中桥梁盆式支座腐蚀失效故障树分析

腐蚀是桥梁盆式支座的常见病害之一，针对引起盆式支座腐蚀失效的各个因素，结合大气腐蚀、防腐涂装失效等机理，建立以盆式支座腐蚀失效为顶事件的故障树，通过布尔代数运算得到故障树的最小割集，从而得出导致支座腐蚀发生的主要因素，分析表明大气环境腐蚀因素、支座后期维护不善、支座局部构造不合理是导致支座腐蚀的主要因素，并针对这些原因提出了相应的改进措施和建议，以降低支座腐蚀失效发生的可能性。

Fault Tree analysis of Corrosion Failure for Bridge Pot-bearings in Marine Atmosphere

Corrosion is one of the common diseases of bridge pot-bearings. Considering the various of factors that cause corrosion failure, combining with atmospheric corrosion mechanism and anticorrosive coatings failure mechanism, established a fault tree, of which top event is the corrosion failure of pot- bearings. The minimal cut-sets of the fault tree was obtained by Boolean operation, and then the impor- tant bottom events which caused corrosion failure of pot bearings were found. Results show that the main factors which cause corrosion failure of pot-bearings are marine atmospheric corrosive factors, poor main- tenance and unreasonable structure of pot-bearings. Some improvements with respect to the main factors had been proposed, which can reduce the possibility of corrosion failure.